Hi MaryB , thanks for responding.
We are all using the same domain (business), and have all migrated across from Wunderlist where we all used our business email address. We can each see the shared lists (and they have the people icon indicating that they are shared) - but there is no active sharing (tested).
We can create and send an invitation link as per your query, but when the other party clicks on this the following message appears:
Unavailable list. Lists can only be shared between personal accounts, or between work or school accounts in the same organisation.
We have tested setting up new lists without success.
I wonder if there is something in the settings to ensure that we are all linked correctly through our organisation, but haven't been able to find anything obvious. We had hoped the seamless transition would have been just that but at this stage this is disappointingly no longer a useful tool in our business.
Thank you!